Total Time= sector read time+ track access time+ rotational Delay+ Sector write time
Here, track access time= 2 ms
1 min is needed for 3600 rotation, then 60 rotations are carried out in 1 sec.
Then, time for one rotation= 1/ 60= 16.66 ms
Time to read one sector= time for one rot. / no of sectors = .52 ms.
Now rotation time to head up the write head on sector 9 = 16.66* 31/ 32 = 16.2 ms
Seek time will be overlapped with the rotation time for positioning of head
Then, total time= 0.52 + 2 + 16.2+ 0.52= 19.24 ms